Sereg Control Valves

The SeregTM control valve product line includes rotary eccentric plug, cryogenic and globe-style models that utilize pneumatic diaphragm and piston cylinder actuators.

The Sereg rotary eccentric plug valve offers the advantages of low torque operation, while providing ANSI Class IV shutoff with metal seats and Class VI shutoff with soft seats. This exceptional shutoff is made possible through the double offset seating that 'cams' the plug into the seat.

The Sereg line of eccentric plug valves also features an open-throat design of the closure element, allowing higher flows than other manufacturers' valves of comparable size. The Sereg product line also offers a full range of globe valves designed for cold box cryogenic and industrial gas applications. Sereg cryogenic bodies are constructed for high impact resistance at low temperature and allow minimal heat transfer. The unique MaxFlo 3 stem, provides a safer arrangement with the integral thrust runner and anti-blow out protection. The MaxFlo 3 control valve has a durable flanged end post design eliminating all possibility of any parts coming loose and traveling downstream. The flanged end post is held in place by four bolts.

The MaxFlo 3 plug design will either fail-open (shaft downstream) or closed (shaft upstream) in the event of air or instrument signal loss. Longer life is also a key principle behind the MaxFlo 3 control valve. Its oversized shaft eliminates shaft failures
and provides a large shaft bearing surface, reducing bearing wear, improving reliability and increasing the life of the valve. The plug is produced from hardened 17-7PH material to increase plug life, provide tight shutoff and increase reliability in a wide range of difficult to- handle applications (including flashing, erosive, mild cavitation and steam services).

The rugged plug design reduces valve failure caused by water hammer. The non-crossover shaft allows for uninterrupted flow. When the valve is in the open position, the fluid flow is not deflected into the seat or retainer, providing greater reliability — even after years of service. The durable flanged end post design provides a robust bearing surface. Since the end post is held in place by four bolts, it can’t come loose in service like other manufacturers’ designs

The typical maintenance cycle for the MaxFlo 3 valve exceeds five years and more than 20 years for total valve cycle expectancy. Most MaxFlo 3 actuators have a cycle life exceeding one million cycles, making the MaxFlo 3 design one of the most reliable control valves on the market.

Special Valtek packing sets, such as SureGuard™ packing, are available to control fugitive emissions and to meet Environmental Protection Agency (EPA) requirements.
The MaxFlo 3 double-offset eccentric plug rotates into the seat at an angle that eliminates sliding over the seat surface . The design reduces seat wear, and thereby decreases maintenance requirements and costs. At the same time, a tight ANSI Class VI shutoff is easily obtainable using the soft seat design.

The Product range includes:

• MaxFlo double offset eccentric Rotary Valves
• Maxflo 3 double offset eccentric Rotary Valves up to Class 150-300
• NACE certification is available with the MaxFlo 3 design
• Shut-off for Soft seated to Class VI and Metal seated to class IV
• Super polished body and plugs available
• Rotary actuators and extended bonnets
• Digital Positioners Logix 500si series
• Cryogenic Valves for special applications